mirror of
https://github.com/ntop/ntopng.git
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130 lines
4 KiB
C++
130 lines
4 KiB
C++
/*
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*
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* (C) 2013-18 - ntop.org
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include "ntop_includes.h"
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
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/* http://resin.csoft.net/cgi-bin/man.cgi?section=0&topic=divert */
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/* **************************************************** */
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static void* divertPacketPollLoop(void* ptr) {
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DivertInterface *iface = (DivertInterface*)ptr;
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int fd;
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/* Wait until the initialization completes */
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while(!iface->isRunning()) sleep(1);
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fd = iface->get_fd();
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while(iface->isRunning()) {
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int len;
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u_char packet[IP_MAXPACKET];
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struct sockaddr_in sin;
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socklen_t sin_len = sizeof(struct sockaddr_in);
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u_int16_t c;
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struct pcap_pkthdr h;
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Host *srcHost = NULL, *dstHost = NULL;
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Flow *flow = NULL;
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len = recvfrom(fd, packet, sizeof(packet), 0,
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(struct sockaddr *)&sin, &sin_len);
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if(len == 1) {
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ntop->getTrace()->traceEvent(TRACE_ERROR, "Receive error");
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break;
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}
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if(len < sizeof(struct ip)) {
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ntop->getTrace()->traceEvent(TRACE_ERROR, "Packet too short (%d bytes)", len);
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break;
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}
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#ifdef __OpenBSD__
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struct timeval tv;
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h.len = h.caplen = len, gettimeofday(&tv, NULL);
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h.ts.tv_sec = tv.tv_sec;
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h.ts.tv_usec = tv.tv_usec;
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#else
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h.len = h.caplen = len, gettimeofday(&h.ts, NULL);
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#endif /* __OpenBSD__ */
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iface->dissectPacket(DUMMY_BRIDGE_INTERFACE_ID,
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true /* ingress packet */,
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NULL, &h, packet, &c, &srcHost, &dstHost, &flow);
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/* Enable the row below to specify the firewall rule corresponding to the protocol */
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#if 0
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sin.sin_port = c | 0x1000 /* DIVERT_ALTQ */;
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#endif
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if(sendto(fd, packet, len, 0, (struct sockaddr *)&sin, sin_len) < 0)
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ntop->getTrace()->traceEvent(TRACE_ERROR, "sendto(len=%d,sin_len=%d,altq=%d) failed [%d/%s]",
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len, sin_len, c, errno, strerror(errno));
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}
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "Leaving divert packet poll loop");
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return(NULL);
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}
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/* **************************************************** */
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DivertInterface::DivertInterface(const char *name) : NetworkInterface(name) {
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struct sockaddr_in sin;
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socklen_t sin_len;
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port = atoi(&name[7]);
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if((sock = socket(PF_INET, SOCK_RAW, IPPROTO_DIVERT)) == -1) {
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ntop->getTrace()->traceEvent(TRACE_ERROR, "Unable to created divert socket");
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throw 1;
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}
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET, sin.sin_port = htons(port);
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sin_len = sizeof(struct sockaddr_in);
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if(::bind(sock, (struct sockaddr *) &sin, sin_len) == -1) {
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ntop->getTrace()->traceEvent(TRACE_ERROR, "Unable to bind divert socket to port %d", port);
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throw 1;
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}
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "Created divert socket listening on port %d", port);
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pcap_datalink_type = DLT_IPV4;
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}
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/* **************************************************** */
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DivertInterface::~DivertInterface() {
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closesocket(sock);
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}
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/* **************************************************** */
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void DivertInterface::startPacketPolling() {
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pthread_create(&pollLoop, NULL, divertPacketPollLoop, (void*)this);
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pollLoopCreated = true;
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NetworkInterface::startPacketPolling();
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}
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/* **************************************************** */
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#endif /* defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__) */
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